{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "beta - estradiol 17 - valerate ( EV ) is a synthetic estrogen widely used in combination with other steroid hormones in hormone replacement therapy drugs and is detected in natural waters ."}
{"Chemical": ["beta - estradiol 17 - valerate", "estrogen", "steroid hormones"]}